Physocarpus ‘POIPD2’

ABSTRACT

A new and distinct  Physocarpus  cultivar named ‘POIPD2’ is disclosed, characterized by a smaller plant size, with a round, compact habit. Foliage is small and distinctively burgundy. Plants exhibit good mildew resistance. The new variety is a  Physocarpus , normally produced as an outdoor garden or container plant.

Latin name of the genus and species:

Physocarpus opulifolius

Variety denomination: ‘POIPD2’.

BACKGROUND OF THE INVENTION

The new Physocarpus cultivar is a product of a planned breeding programconducted by the inventor, Timothy D. Wood, in Grand Haven, Minn. Theobjective of the breeding program was to produce new Physocarpusvarieties with unique foliage. The cross resulting in this new varietywas made during June of 2005.

The seed parent is the unpatented, unnamed Physocarpus opulifoliussubsp. intermedius f. parvifolius. The pollen parent is the unpatented,Physocarpus opulifolius ‘D#2’. The new variety was identified as apotentially interesting selection in May of 2008, at a nursery in SpringLake, Minn.

Asexual reproduction of the new cultivar ‘POIPD2’ by softwood cuttingswas first performed during Summer of 2008, at commercial greenhouse inGrand Haven, Minn. Subsequent propagation has shown that the uniquefeatures of this cultivar are stable and reproduced true to type in 5successive generations.

SUMMARY OF THE INVENTION

The cultivar ‘POIPD2’ has not been observed under all possibleenvironmental conditions. The phenotype may vary somewhat withvariations in environment such as temperature, day length, and lightintensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined tobe the unique characteristics of ‘POIPD2’ These characteristics incombination distinguish ‘POIPD2’ as a new and distinct Physocarpuscultivar:

-   -   1. Smaller plant size.    -   2. Small, dark burgundy leaves.    -   3. Attractive, rounded compact habit.    -   4. Good mildew resistance.

PARENT COMPARISON

Plants of the new cultivar ‘POIPD2’ are similar to plants of the seedparent, Physocarpus opulifolius subsp. intermedius f. parvifolius inmost horticultural characteristics, however, plants of the new cultivar‘POIPD2’ differs in the following:

-   -   1. Burgundy leaves, the parent has green leaves.    -   2. Larger plant size, parent is more dwarf in nature.    -   3. Larger leaves.    -   4. Rounded plant habit, the parent is low, mounded and arching        in form.

Plants of the new cultivar ‘POIPD2’ are similar to plants of the pollenparent, Physocarpus opulifolius ‘D#2’ in most horticulturalcharacteristics, however, plants of the new cultivar ‘POIPD2’ differs inthe following:

-   -   1 Darker leaf color.

COMMERCIAL COMPARISON

Plants of the new cultivar ‘POIPD2’ can also be compared to thecommercial variety Physocarpus ‘Seward’, U.S. Plant Pat. No. 14,821.These varieties are similar in most horticultural characteristics;however ‘POIPD2’ differs in the following:

-   -   1. Lighter leave color.    -   2. Less compact.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photograph in FIG. 1 illustrates in full color atypical mature plant of ‘POIPD2’.

FIG. 2 illustrates in full color a typical inflorescence of ‘POIPD2’grown outdoors in Grand Haven, Minn., in a garden setting. Age of theplant photographed is approximately 4 years from a young plant.

The photographs were taken using conventional techniques and althoughcolors may appear different from actual colors due to light reflectanceit is as accurate as possible by conventional photographic techniques.

DETAILED BOTANICAL DESCRIPTION

In the following description, color references are made to The RoyalHorticultural Society Colour Chart 2007 except where general terms ofordinary dictionary significance are used. The following observationsand measurements describe ‘POIPD2’ plants grown outdoors in Grand Haven,Minn. This occurred during June of 2014. The plants were between 1 to 2years old grown in 1 gallon containers. The growing temperature rangedfrom −30° C. to 37° C. The garden is un-shaded, giving bright, normalsunlight conditions. Measurements and numerical values representaverages of typical plant types.

-   Botanical classification: Physocarpus opulifolius ‘POIPD2’.

PROPAGATION

-   Time to initiate roots: About 15 days at approximately 25° C.-   Root description: Fine, and freely branching.-   Time to produce a liner: About 65 days at 25° C.

PLANT

-   Plant type: Shrub perennial.-   Age of plant described: Approximately 1 to 2 years old.-   Growth habit: Upright and outward.-   Pot size of plant described: 1 gallon pot.-   Height: Approximately 25 cm to top of foliage.-   Plant spread: Approximately 20 cm.-   Growth rate: Rapid.-   Plant vigor: Strong.-   Branching characteristics: When pinched branches form at every    internode.-   Length of primary lateral branches: Approximately 25 cm.-   Diameter of lateral branches: Approximately 3 cm.-   Quantity of lateral branches: Average 10.-   Stem:    -   -   Stem color.—Near RHS Greyed-purple 183A.        -   Bark color.—Near RHS Brown 200C.-   Internode length: Average 3.6 cm.

FOLIAGE

-   Leaf:    -   -   Arrangement.—Alternate, single.        -   Average length.—Approximately 5.5 cm.        -   Average width.—Approximately 5.3 cm.        -   Shape of blade.—Ovate, deeply lobed with three lobes per            leaf.        -   Apex.—Acute.        -   Base.—Cordate-Obtuse.        -   Attachment.—Stalked.        -   Margin.—Serrate-dentate.        -   Texture of top surface.—Smooth, glabrous.        -   Texture of bottom surface.—Veins protrude, smooth between            veins.        -   Color.—Young foliage upper side: Near RHS Greyed-purple            187B. Young foliage under side: Combination of Near RHS            Yellow-green 148A and Greyed-purple 187B. Mature foliage            upper side: Near RHS Greyed-purple 187B overlaying            Yellow-green 147A. Mature foliage under side: Near RHS            Greyed-purple 187B overlaying Yellow-green 147A.        -   Venation.—Type: Pinnate. Venation color upper side: Near RHS            Green 131A. Venation color under side: Near RHS Yellow-green            147C.        -   Petiole.—Average Length: Approximately 3.1 cm. Diameter:            Approximately 1-1.5 mm. Petiole color upper side: Ridges            near RHS Brown 200B; Center near RHS Yellow-green 147C.            Petiole color lower side: Near RHS Yellow-green 147C.            Petiole Texture upper side; Two ridges run on the edges of            the petiole, otherwise smooth. Petiole Texture lower side;            Glabrous.

FLOWER

-   Natural flowering season: Spring.-   Inflorescence type and habit: Corymb.-   Flower longevity on plant: Individual flowers last approximately 2    to 3 days on the plant. Each corymb lasts approximately 4 weeks with    flowers.-   Quantity of flowers per inflorescence: About 28.-   Inflorescence size:    -   -   Width.—Approximately 4 cm.        -   Height.—Approximately 2.5 cm.-   Quantity of flowers per lateral stem: Hundreds.-   Quantity of flowers per plant: Thousands.-   Individual flowers:    -   -   Flower form.—Cupped.        -   Flower aspect.—Upright.        -   Size.—Diameter: Approximately 4-5 mm. Length: Approximately            4 mm. Depth: 4 mm. Persistence: Self cleaning.-   Petal:    -   -   Petal arrangement.—Whorl.        -   Number of petals per flower.—5.        -   Petal appearance.—Smooth, opaque.        -   Petal shape.—Rounded and obovate.        -   Margin.—Entire.        -   Tip shape.—Obovate.        -   Length.—2 mm.        -   Width.—2 mm.        -   Texture.—Upper: Smooth. Lower: Smooth.-   Petal color:    -   -   When opening.—Upper surface: Near RHS Red 49C. Lower            surface: Near RHS Red 49C.        -   Fully opened.—Upper surface: Near RHS White 155D. Lower            surface: Near RHS White 155D.        -   Fading.—Upper surface: Near RHS White 155D. Lower surface:            Near RHS White 155D.-   Bud:    -   -   Shape.—Obovate.        -   Length.—Approximately 2 mm.        -   Diameter.—Approximately 1.5 mm.        -   Color.—Near RHS Red 49D.-   Sepals:    -   -   Shape.—Lanceolate.        -   Arrangement.—Whorl.        -   Length.—Approximately 2 mm.        -   Width.—Approximately 1 mm.        -   Margin.—Entire.        -   Base.—Fused.        -   Tip.—Acuminate.        -   Texture.—Smooth.        -   Color.—Immature: Near RHS Green 138A, heavily flushed Purple            N79A. Mature: Near RHS Yellow-green 146C at base and Near            RHS Red 51A at tip.-   Peduncle:    -   -   Length.—Average 1.5 cm.        -   Diameter.—1 mm.        -   Color.—Near RHS Yellow-green 146C.        -   Orientation.—Upright, straight.        -   Strength.—Good.        -   Texture.—Smooth.

REPRODUCTIVE ORGANS

-   Stamens:    -   -   Number.—25-28.        -   Filament length.—Approximately 1 mm.        -   Filament color.—Near RHS White 155D.-   Anthers:    -   -   Shape.—Elliptic to round.        -   Length.—Approximately 0.5 mm.        -   Color.—Near RHS Red 50C and Yellow-orange 18A.        -   Pollen.—Some.-   Pistil:    -   -   Number.—Average of 4.        -   Length.—Approximately 0.25 mm.        -   Style.—Length: Approximately 0.5 cm. Color: Near RHS            Red-Purple 73D.        -   Stigma.—Shape: Globular. Color: Near RHS Yellow-green 146D.            Ovary color: Near RHS Green 137B.

OTHER CHARACTERISTICS

-   Seeds and fruits: Not observed to date.-   Garden performance: Very good.-   Disease/pest resistance: Neither resistance nor susceptibility to    pathogens and pests common to Physocarpus have been observed.-   Temperature tolerance: The new variety tolerates temperatures    between −30 to 37° C.

What is claimed is:
 1. A new and distinct cultivar of Physocarpus plantnamed ‘POIPD2’ as herein illustrated and described.